How Many? A Dictionary of Units of Measurement
© Russ Rowlett and the University of North Carolina at Chapel Hill

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About the Dictionary
Using the Dictionary

Australian Tropical Cyclone Categories

Data, provided by the Australian Bureau of Meteorology, is from the Hurricane FAQ posted by the U.S. Atlantic Oceanographic and Meteorological Laboratory in Miami, Florida.

Tropical Cyclone Severity
Categories Winds Typical effects
(indicative only)
Category 1 Strongest gust less than 125 km/h Negligible house damage. Damage to some crops, trees and caravans. Craft may drag moorings.
Category 2 Strongest gust 125 - 170 km/h Minor house damage. Significant damage to signs, trees and caravans. Heavy damage to some crops. Risk of power failure. Small craft may break moorings.
Category 3
(eg. Winifred)
Strongest gust 170 - 225 km/h Some roof and structural damage. Some caravans destroyed. Power failure likely.
Category 4
(eg. Tracy)
Strongest gust 225 - 280 km/h Significant roofing loss and structural damage. Many caravans destroyed and blown away. Dangerous airborne debris. Widespread power failure.
Category 5
(eg. Orson)
Strongest gust More than 280 km/h Extremely dangerous with widespread destruction.


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January 11, 2000